My companies current scenario is about 64% renewal rate from all years before but a 50% of that is from the year before current and 25% percent of that is from

My companies current scenario is about 64% renewal rate from all years before but a 50% of that is from the year before current and 25% percent of that is from 2 years before current and so on and so on.. So how does all this differ if you're looking at renewal from year before and renewals from all time ?